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A colleague observes that switching the default value of LLVM_EXPERIMENTAL_DEBUGINFO_ITERATORS to "On" hasn't flipped the value in their CMakeCache.txt. This probably means that everyone with an existing build tree is going to not have support built in, meaning everyone in LLVM would need to clean+rebuild their worktree when we flip the switch on... which doesn't sound good. So instead, just delete the flag and everything it does, making everyone build and run ~400 lit tests in RemoveDIs mode. None of the buildbots have had trouble with this, so it Should Be Fine (TM). (Sending for review as this is changing various comments, and touches several different areas -- I don't want to get too punchy).
See docs/CMake.html for instructions on how to build LLVM with CMake.